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Sequoia 680 Chesapeake Drive Redwood City,CA 94 (650) 364 9600 FAX(650)364-9233 <br /> 4D 404 N Wiget Lane Walnut Creek,CA 94 (5150) 988 9600 FAX(510)988-%73 <br /> Analytical819 Straker Avenue,Suite 9 Sacramento, CA 9583 (9t6) 921 9600 FAX(9t6)921-p100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton j 971121-G1 <br /> 1680 Rogers Ave Matrix Liquid <br /> ' San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9711 E95-01-03, 05 Reported Dec 12, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. MTBE <br /> QC Batch# MS120497MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method: NA <br /> Analyst M Williams <br /> MS/MSD# 97111"9405 <br /> Sample Conc : 58 <br /> Prepared Date: 12/4/97 <br /> Analyzed Date 12/4/97 <br /> Instrument I D # F3 <br /> Conc Spiked 50ug/L <br /> Result- 55 <br /> MS %Recovery 98 <br /> . Dup Result 58 <br /> MSD % Recov .. 104 <br /> RPD 53 <br /> RPD Limit 0-25 <br /> LCS#. LCS120497 <br /> Prepared Date 12/4/97 <br /> Analyzed Date 12/4/97 <br /> Instrument I D #. F3 <br /> Conc Spiked. 50 ug/L <br /> LCS Result 51 <br /> LCS % Recov. 102 <br /> 60 140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LGS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> A A ALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Peg enner <br /> I <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9711E95 BLA <3> <br />